128131857658 has 32 divisors (see below), whose sum is σ = 232903152000. Its totient is φ = 51643713024.

The previous prime is 128131857641. The next prime is 128131857703. The reversal of 128131857658 is 856758131821.

It is a junction number, because it is equal to n+sod(n) for n = 128131857599 and 128131857608.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1721583 + ... + 1794466.

It is an arithmetic number, because the mean of its divisors is an integer number (7278223500).

Almost surely, 2^128131857658 is an apocalyptic number.

128131857658 is a deficient number, since it is larger than the sum of its proper divisors (104771294342).

128131857658 is a wasteful number, since it uses less digits than its factorization.

128131857658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3516214.

The product of its digits is 3225600, while the sum is 55.

The spelling of 128131857658 in words is "one hundred twenty-eight billion, one hundred thirty-one million, eight hundred fifty-seven thousand, six hundred fifty-eight".